Steel structure pipe truss assembly

• Posted by 123 asd May 24, 2023 Filed in Business #  #space truss  36 views
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  (1) According to the established plane control network and elevation control network, check the measurement data of concrete columns and anchors submitted by the previous process;

  (2) Measurement data shall include three parts: column centerline positioning and elevation survey and design map, centerline and elevation actual measurement data after completion, and settlement and displacement observation data. The allowable error of the elevation of the embedded parts at the top of the column handed over by the previous process is (+0≥, ≥-3mm), the deviation of the centerline of the embedded parts at the top of the column is ±5mm, and the overall levelness is less than 3mm;

  (3) The tools used for stakeout construction on the construction site include: theodolite, level, level ruler, 50m tape measure, 5m tape measure each, square, vertical ball, colored pens, etc.;

  (4) Determine each axis and elevation according to the reference point and reference axis provided by the civil engineering, and mark the axis position on the axis template with a colored pen;

  (5) According to the distance of each axis, mark the positioning line perpendicular to the axis on the template. Embed each embedded part according to the size requirements of the drawing according to the progress of the civil work;

  Installation and fixing of embedded parts;

  (7) Scaffolding shall be set up as a construction platform according to site conditions during construction.

  Check and acceptance of column top anchor bolts

  (1) The row and column line marks and elevation datum points of the column top anchor bolts are complete and accurate;

  (2) The top surface of the concrete column is flat;

  (3) Recheck the dimensions of the anchor bolts at the top of the column and the installation of the structure, and the results should conform to the "Code for Acceptance of Construction Quality of Steel Structure Engineering";

  (4) The main truss is cut in the factory, prefabricated in sections, derusted by shot blasting to Sa2.5 level, and painted with workshop primer to make semi-finished products, and then transported to the installation site for assembly. The steel truss girder is prefabricated into two sections in the factory, and each section is 19 meters long. 5. Steel components are transported into the site;

  (5) The rest of the components shall be supplied in complete sets according to the installation sequence after passing the inspection at the factory. When the components are transported, vehicles shall be selected according to the length and weight. The protruding length, binding method, and pads between components ensure that the components will not be deformed during transportation and the coating will not be damaged. During loading, unloading and hoisting work, the space between the steel wire rope and the components must be protected by pads;

  According to the site plan, stack the components to the designated location. The component storage site must be flat and firm without water accumulation. The bottom layer of component stacking should be cushioned with oil-free sleepers. The fulcrums of the steel components of each layer must be on the same vertical line to prevent the steel components from being crushed and deformed. After the components are stacked, there will be obvious signs indicating the model, specification and quantity of the components for installation;

  (7) After the components are transported to the site, they should be classified, counted, checked for size and identification according to the construction drawings, and checked for quality certificates, design change documents, and technical information necessary for component delivery.